C++:如何获取指向二维动态数组的指针？

Question

我看了this excellent answer但无法弄清楚如何将其应用于此片段:

//this is in the .hpp file
std::atomic<int> size = 10;
std::recursive_mutex *locks[2];

//in some function of the class
//it's important that the 2nd array dimension is dynamic
the_lock[0] = new std::recursive_mutex[size]; 
the_lock[1] = new std::recursive_mutex[size];
std::recursive_mutex (*locks_2)[2][size] = &locks;

作业给我

error: cannot convert ‘std::recursive_mutex* (*)[2]’ to ‘std::recursive_mutex (*)
[2][(((sizetype)(((ssizetype)((**here be long type information, since I'm using
templates a lot**, long unsigned int, std::less<long unsigned int>          
>::size.std::atomic<long unsigned 
int>::<anonymous>.std::__atomic_base<_IntTp>::operator 
std::__atomic_base<_IntTp>::__int_type<long unsigned int>()) + -1)) + 1)]’ in 
initialization

如何获得指向“锁”的指针？

Answer 1

错误信息其实是免费赠送解决方案:

std::recursive_mutex * (*locks_2)[2] = &locks;